单项选择题

We should make a clear ______ between the two scientific terms for the purpose of our discussion.

A．distinction
B．discrimination
C．deviation
D．separation
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单项选择题
Even though leather gloves are much more expensive, they are more ______ than vinyl.
A．resistant
B．persistent
C．permanent
D．durable
单项选择题
Any salesperson who sells more than the weekly ______ will receive a bonus.
A．ratio
B．quota
C．allocation
D．portion
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